A computer program to compute and analyse one-dimensional isentropic compressible flow through variable cross-sectional area with or without a normal shock is developed. The program is written in the "FORTRAN LANGUAGE".

In this work, the area change is the predominant cause of change of flow condition. One of the advantage of this program is set on general uses for isentropic flow. In common practice, the values of the isentropic flow property ratios were tabulated or graphically presented as function of the Mach number with a specified specific heat ratio, K (normally K=1.40 was presented). With todays technology, the most versatile method is by implementation of computer programming method.

The computer program presented can solve all the onedimensional isentropic flow problems and to analyse the flow characteristic and the flow patterns in converging nozzle and converging-diverging nozzle. The value of K can be assigned as any value as one's requirement. All the solutions are computed within 0.1 error. For solving Mach number and location of normal shock inside the nozzle, ITERATION method is employed instead of numerical method. In most cases, a few iterations (less than ten) may arise a reasonable solutions.